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Aqueous ink composition for writing instrument

a writing instrument and composition technology, applied in the field of writing instruments, can solve the problems of disadvantageous impairment of the flow stability of ink, clogging due to further accumulation of aggregation, and the accumulation of microcapsule pigment around the ball, and achieve the effect of excellent stability of ink flow

Pending Publication Date: 2021-02-18
MITSUBISHI PENCIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an aqueous ink composition for a writing instrument that has excellent stability of ink flow. It prevents the ink from becoming too thick and clogging the flow. This allows for smoother and more effective writing with the instrument.

Problems solved by technology

However, when these aqueous ink compositions for a writing instrument using a microcapsule pigment are used in a ballpoint pen or the like, the microcapsule pigment aggregates around the ball and clogging due to further accumulation of aggregation occurs.
Thus, the flow stability of the ink is disadvantageously impaired.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 1

[0082]As an oil phase solution, while 17 parts of triethylene glycol distearate (ESTEPEARL 30, melting point: 44 to 51° C., manufactured by Nikko Chemicals Co., Ltd.) was warmed to 65° C., 4 parts of titanium oxide (CR-93, manufactured by Ishihara Sangyo Kaisha, Ltd.) was added thereto and dispersed well. Next, 4 parts of methyl ethyl ketone was added, and 7 parts of a trimethylolpropane-modified product of xylylene diisocyanate (D-110N, manufactured by Mitsui Chemicals, Inc.) were further added. The solution was stirred at 65° C.

[0083]As an aqueous phase solution, 15 parts of polyvinyl alcohol (PVA-205, manufactured by Kuraray Co., Ltd.) was dissolved in 600 parts of distilled water warmed to 65° C., and the above-mentioned oil phase solution was added to this solution, and 6 parts of hexamethylene diamine was further added. The solution mixture was subjected to emulsification and mixing to complete polymerization.

[0084]The formed dispersion was centrifuged to recover microcapsules...

production example 2

[0085]Microcapsule pigments (Particles 2) were obtained in the same manner as in Production Example 1 described above, except that the triethylene glycol distearate of Production Example 1 was replaced with the same amount of ethylene glycol distearate (ESTEPEARL 10V, melting point: 58 to 65° C., manufactured by Nikko Chemicals Co., Ltd.). The average particle diameter of Production Example 2 (Particles 2) was 2.8 μm.

production example 3

[0086]Microcapsule pigments (Particles 3) were obtained in the same manner as in Production Example 1 described above, except that the triethylene glycol distearate of Production Example 1 was replaced with the same amount of glycerin monostearate (RHEODOL MS-50, melting point: 55 to 65° C., manufactured by Kao Corporation). The average particle diameter of Production Example 3 (Particles 3) was 3.2 μm.

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PUM

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Abstract

Provided is an aqueous ink composition for a writing instrument with excellent stability of ink flow and the like, in which aggregation of a microcapsule pigment and clogging due to such aggregation are suppressed. The aqueous ink composition for a writing instrument includes a microcapsule pigment which includes inside, at least, a pigment and a medium of a fatty acid polyol ester. A melting point of the fatty acid polyol ester is preferably 40° C. or higher, and is preferably 70° C. or lower.

Description

TECHNICAL FIELD[0001]The present invention relates to an aqueous ink composition for a writing instrument using a microcapsule pigment which includes inside a pigment with a high specific gravity such as titanium oxide or a pigment with a somewhat poor dispersibility such as carbon black.BACKGROUND ART[0002]There are known aqueous ink compositions for a writing instrument (for example, Patent Documents 1 to 3) using a microcapsule pigment formed by microencapsulating a pigment with a high specific gravity such as titanium oxide or a pigment with a somewhat poor dispersibility such as carbon black in order to improve the dispersibility and the like.[0003]However, when these aqueous ink compositions for a writing instrument using a microcapsule pigment are used in a ballpoint pen or the like, the microcapsule pigment aggregates around the ball and clogging due to further accumulation of aggregation occurs. Thus, the flow stability of the ink is disadvantageously impaired.[0004]On the ...

Claims

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Application Information

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IPC IPC(8): C09D11/17C09D17/00
CPCC09D11/17C09D17/001C09D17/005C09D17/007C09D11/18C09D17/00B01J13/02
Inventor OGURA, KOUSUKEHIRAYAMA, AKIKOMIYOSHI, KANA
Owner MITSUBISHI PENCIL CO LTD